create(MainActivity.class)
Car : module.provideCar()
初始化
AndroidInjector
mainActivitySubComponentBuilderProvider
injectorFactories
AppComponent.Builder
继承
factory ：MainActivitySubcomponentBuilder
inject(activity)
MainActivityModule_ProvideCarFactory
get(MainActivity.class)
injector ：MainActivitySubcomponentImpl
(MainActivity.calss) car
Map(key：MainActivity.class；value： ）
build()
factoryProvider ： mainActivitySubComponentBuilderProvider
get()
return new MainActivityModule_ProvideCarFactory(module)
create(builder.mainActivityModule)
inject(DaggerApplication）
provideCarProvider
DispatchingAndroidInjector
DaggerAppComponent
